it work but its not adding the 0's. When I search by name I get 35467011236 and not 0035467011236
Insert into dbo.AddressBook (txtphone,txtName)
VALUES
(0035467011236,'Felipe'),
(008656540,'Christopher Brown'),
(0108965490,'Mrs Roberts');
0035467011236 is a number, where leading zeroes can be (will be) ignored. If you want a string (and a phonenumber is not a number but a string), quote it.
That txtphone has a varchar type, hasn't it? (it should)
001 is equal to 1 for SQL numberic type column. So if you try to save data with leading zero in numeric type datatype, it will remove the leading zero.
If your requirement is to save number with leading zero, you need to change your datatype to String type (Nvarchar, Varchar)
You are saving your number without quote, that means you have taken txtnumber with numeric datatype. you must change your datatype to string type.
Related
I am working with an Oracle DB 11g
I have a database table with the primary key being a CHAR(4) - Though only numbers are used for this column.
I noticed that there are some records that for example show '0018' or '0123'.
So few things I noticed odd and needed some help on
-Does a CHAR column "automatically" pad zeros to a value?
-Also I noticed when writing a SQL that if I DONT use quotes in my where clause that it returns results, but if I do use quotes it does not? So for example
DB CHAR(4) column has a key of '0018'
I use this query
SELECT * FROM TABLE_A WHERE COLUMN_1=18;
I get the row as expected.
But when I try the following
SELECT * FROM TABLE_A WHERE COLUMN_1='18';
This does NOT work but this does work again
SELECT * FROM TABLE_A WHERE COLUMN_1='0018';
So I am a bit confused how the first query can work as expected without quotes?
Does a CHAR column "automatically" pad zeros to a value?
No. From the documentation:
If you insert a value that is shorter than the column length, then Oracle blank-pads the value to column length.
So if you insert the number 18 it will be implicitly converted to the string '18 ', with two trailing spaces. You can see that in this fiddle, which also shows the comparisons.
That means something else is zero-padding your data - either your application/code before inserting, or possibly in a trigger.
Also I noticed when writing a SQL that if I DONT use quotes in my where clause that it returns results, but if I do use quotes it does not
The data type comparison and conversion rules are shown in the documentation too:
When comparing a character value with a numeric value, Oracle converts the character data to a numeric value.
When you do:
SELECT * FROM TABLE_A WHERE COLUMN_1=18;
the string '0018' is implicitly converted to the number 18 so that it can be compared with your numeric literal. The leading zeros are meaningless once it's converted, so '0018', '018 ' and 18 ' would all match.
With your zero-padded column value that matches and you do get a result: 18 ('0018' converted to a number) = 18
That means that every value in the table has to be converted before it can be compared; which also means that if you has a normal index on column_1 then it wouldn't be utilised in that comparison.
When you do:
SELECT * FROM TABLE_A WHERE COLUMN_1='18';
the column and literal are the same data type so no conversion has to be applied (so a normal index can be used). Oracle will use blank-padded comparison semantics here, because the column is char, padding the shorter literal value to the column size as '18 ', and then it will only match if the strings match exactly - so '18 ' would match but '0018' or ' 18 ' or anything else would not.
With your zero-padded column value that does not match and you don't get a result: '0018' != '18 ' ('18' padded to length 4)
When you do:
SELECT * FROM TABLE_A WHERE COLUMN_1='0018';
the column and literal are the same data type so no conversion, no padding is applied as the literal is already the same length as the column value, and again it will only match if the strings match exactly - so '0018' would match but '18 ' or ' 18 ' or anything else would not.
With your zero-padded column value that matches and you do get a result: '0018' = '0018'
Does a CHAR column "automatically" pad zeros to a value?
Not always zero's sometimes spaces. if all characters values are numeric yes it will pad zeros up to a fixed size of the character field.
So I am a bit confused how the first query can work as expected without quotes?
Because of implicit type conversions. The system is casting either the char to numeric or the numeric to char in which case it either drops the leading zeros and compares numeric values or it pads to be of the same data type and then compares. I'm pretty sure it's going character to numeric and thus the leading zeros are dropped when comparing.
See: https://docs.oracle.com/cd/B13789_01/server.101/b10759/sql_elements002.htm for more details on data type comparison and implicit casting
More:
in the case of : SELECT * FROM TABLE_A WHERE COLUMN_1='18'; I
think the 18 is already a character data so it becomes '18 ' (note 2 spaces after 18)
compared to '0018'
SELECT * FROM TABLE_A WHERE COLUMN_1=18; columN_1 gets cast to numeric so 18=18
SELECT * FROM TABLE_A WHERE COLUMN_1='0018'; column_1 is already a char(4) so '0018' = '0018'
I have a db table in oracle where I have a column defined as a number.
The columns contains numbers like:
MyColumn
12540000000
78590000000
I want to find the records by searching MyColumn=12540000000 as well as MyColumn=1254 (without trailing zeros).
What could I try? TO_CHAR and a cutting logic or is there something more simple?
rtrim(MyColumn, '0') = '1254'
Note that on the right I enclosed the string within quotes (so it is really seen as a string, not a number). Apparently you are treating these as strings, right? Even if MyColumn is a number, it will be implicitly converted to a string before applying rtrim.
I have a column containing a combination of numeric and alphanumeric values. When the value is strictly numeric, the database stores it with leading zeroes (but not always), but not if not.
Here's some sample data:
I need to use these values as part of a string that I will use to join to another table. Unfortunately, the portion of the string that corresponds to this field in the other table snips off the leading zeroes of any of the numeric-only values. I'm stumped finding a method of snipping the leading zeroes ONLY in this case.
I found this solution, but it's not for SQL Server (2012). Trim leading zeroes if it is numeric and not trim zeroes if it is alphanumeric
I also saw this, but it also removes the leading zeroes from the hyphenated values shown in the example, which doesn't work. Better techniques for trimming leading zeros in SQL Server?
Help! Thanks!
You could use:
select (case when col not like '%[^0-9]%'
then convert(varchar(255), try_convert(numeric(38), col))
else col
end)
This works for up to 38 digits after the leading zeros
The database does not store anything in varchar (text) fields except what you give it. If you give it leading zeroes, it will save them, it has no reason not to as it's just a piece of text.
For your problem, you can do this:
ISNULL(CAST(TRY_CAST(field AS numeric(38)) AS varchar(insert_field_length))), field)
select CONCAT(convert(char, 123), 'sda');
Or
select convert(char, 123) + 'sda'
Or
select ltrim(convert(char, 123) + 'sda')
Output is:
How can I get the output without those spaces?
The problem here is 2 fold. Firstly that you are converting to a char, which is a fixed width datatype, and secondly that you aren't defining the length of your char, therefore the default length is used. For CAST and CONVERT that's a char(30).
So, what you have to start is convert(char, 123). This converts the int 123 to the fixed width string '123 '. Then you concatenate the varchar(3) value 'sda' to that, resulting in '123 sda'. This is working exactly as written, but clearly not as you intend.
The obvious fix would be to use a varchar and define a length, such as CONCAT(CONVERT(varchar(5),123),'sda') which would return '123sda', however, all of the CONCAT function's parameters are a string type:
string_value
A string value to concatenate to the other values. The CONCAT function requires at least two string_value arguments, and no more than 254 string_value arguments.
This means you can simply just pass the value 123 and it'll be implicitly cast to a string type: CONCAT(123,'sda').
To reiterate my comment's link too: Bad Habits to Kick : Declaring VARCHAR without (length)
You are using char while you probably want [n]varchar(...): the former pads the string with white spaces, while the latter does not:
concat(convert(varchar(10), 123), 'sda');
But simpler yet: concat() forces the conversion of its arguments to the correct datatype by default, so this should do it:
concat(123, 'sda')
First, in SQL Server, never us char or related string definitions without a length. SQL Server requires a length and the default depends on the context. If you depend on the default length your code has a bug just waiting to happen.
Second, char is almost never what you want. It is a fixed length string, with shorter strings padded with spaces.
If you want an explicit conversion use varchar, variable length strings:
select convert(varchar(255), 123) + 'sda'
Or dispense with the explicit conversion and use concat():
select concat(123, 'sda')
As the others have already pointed out the root cause of the issue, if you cannot edit the datatype, you can always use SELECT CONCAT(TRIM(CONVERT(char,123)),'sda'). Although it's highly recommended to either use varchar(n) or give exclusive length of char as it is kind of pointless to create fixed length string and then reduce the length by using TRIM. varchar(30) would perfectly fit in here as the length can still NOT exceed the 30 symbols, but would not use all the length if the string is shorter.
Lets refer to Microsoft docs:
When n isn't specified in a data definition or variable declaration statement, the default length is 1. If n isn't specified when using the CAST and CONVERT functions, the default length is 30.
Reference: https://learn.microsoft.com/en-us/sql/t-sql/data-types/char-and-varchar-transact-sql?view=sql-server-ver15#remarks
So, You have Convert(char, 123), and you did not specify the n for char, so your code is equal to Convert(char(30), 123).
Now it is clear why you have many space characters. To resolve the problem simply use variant length character datatypes such as varchar instead, however I recommend you to always use character datatypes with length. (Same as what #GordonLinoff posted: https://stackoverflow.com/a/63467483/1666800)
select convert(varchar, 123) + 'sda'
Table A
Id varchar(30)
I'm trying to re-create a logic where I have to use 9 digit Ids irrespective of the actual length of the Value of the Id field.
So for instance, if the Id is of length 6, I'll need to left pad with 3 leading zeros. The actual length can be anything ranging from 1 to 9.
Any ideas how to implement this in Teradata SQL?
If the actual length is 1 to 9 characters why is the column defined as VarCar(30)?
If it was a numeric column it would be easy:
CAST(CAST(numeric_col AS FORMAT '9(9)') AS CHAR(9))
For strings there's no FORMAT like that, but depending on your release you might have an LPAD function:
LPAD(string_col, 9, '0')
Otherwise it's:
SUBSTRING('000000000' FROM CHAR_LENGTH(string_col)+1) || string_col,
If there are more than nine characters all previous calculations will return them.
If you want to truncate (or a CHAR instead of a VARCHAR result) you have to add a final CAST AS CHAR(9)
And finally, if there are leading or trailing blanks you might want to use TRIM(string_col)